*{
    padding:0;
    margin:0;
    box-sizing: border-box;
}
html,body{
    /* 比如说span  p 标签会继承 */
    font-size: 12px; 
    height: 100%;
    width: 100%;
   
}



li{
    /* font-size: 12px; */
    padding:0;
    margin:0;
    list-style: none;
}

a ,a:hover{
    /* font-size: 12px; */
    text-decoration:none;
    color:#333;
}
p{
    margin: 0;
    padding: 0;
    -webkit-margin-before: 0;
    -webkit-margin-after: 0;
}


img{border:0;vertical-align:top;}